feat: add douyin-knowledge-animation skill

src/content/skills-zh/douyin-knowledge-animation.md

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+---
+name: douyin-knowledge-animation
+title: 抖音知识动画（竖屏卡点纯动画）
+description: 把任意知识主题制作成抖音竖屏纯动画科普视频：拆解为"悬念封面 + 一句金句一页动画 + 结尾定格"分镜，生成单文件 HTML Canvas 动画（720×1280），内置一键导出双比例封面图，录屏后配卡点 BGM 即可发布。
+source: community
+author: li872
+githubUrl: https://github.com/li872/douyin-publish-skill
+category: marketing
+tags:
+  - 抖音
+  - 知识科普
+  - Canvas动画
+  - 竖屏视频
+  - 卡点视频
+roles:
+  - content
+  - marketer
+featured: false
+popular: false
+isOfficial: false
+installCommand: |
+  git clone https://github.com/li872/douyin-publish-skill
+  cp -r douyin-publish-skill/douyin-knowledge-animation ~/.qoder/skills/
+date: 2026-07-30
+---
+
+## 使用场景
+
+- 想把一个原理、公式或冷知识做成抖音爆款风格的竖屏纯动画视频（无解说、无真人出镜）
+- 需要"一句歌词一个画面"式的卡点知识动画，录屏后在剪映配 DJ 热歌发布
+- 需要自动生成视频封面图（4:3 横版 + 3:4 竖版一键导出）
+
+## 示例
+
+```text
+/douyin-knowledge-animation 红绿灯是怎么配时的
+# 或自然语言触发：
+做一个"电梯为什么总是先上后下"的抖音知识动画
+```
+
+## 注意事项
+
+- 产出为单文件 HTML 动画，按 F 全屏、Enter 播放、C 键导出两张封面 PNG；BGM 需自行在剪映/抖音中添加
+- 技能内置抖音安全区、最小字号、纯白配色等硬性可读性规范，均为实际投稿踩坑后沉淀的经验
+- 采用渐进式披露结构：SKILL.md 为主流程，技术骨架与发布策略在 references/ 目录按需加载

src/content/skills/douyin-knowledge-animation.md

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+---
+name: douyin-knowledge-animation
+title: Douyin Knowledge Animation (Vertical Beat-Synced)
+description: Turn any knowledge topic into a Douyin/TikTok-style vertical animated explainer video. Breaks the topic into "suspense cover + one punchline per animated page + freeze-frame ending" storyboards, generates a single-file HTML Canvas animation (720×1280) with built-in one-key cover image export, ready for screen recording with beat-synced BGM.
+source: community
+author: li872
+githubUrl: https://github.com/li872/douyin-publish-skill
+category: marketing
+tags:
+  - douyin
+  - tiktok
+  - canvas-animation
+  - vertical-video
+  - science-explainer
+roles:
+  - content
+  - marketer
+featured: false
+popular: false
+isOfficial: false
+installCommand: |
+  git clone https://github.com/li872/douyin-publish-skill
+  cp -r douyin-publish-skill/douyin-knowledge-animation ~/.qoder/skills/
+date: 2026-07-30
+---
+
+## Use Cases
+
+- Turn a principle, formula, or fun fact into a viral-style vertical pure-animation video (no narration, no talking head)
+- Create "one lyric line, one scene" beat-synced knowledge animations, then screen-record and add trending BGM in a video editor
+- Auto-generate video cover images (4:3 landscape + 3:4 portrait, exported with one key press)
+
+## Example
+
+```text
+/douyin-knowledge-animation how traffic lights are timed
+# Or trigger with natural language:
+Make a Douyin knowledge animation about why elevators go up before down
+```
+
+## Notes
+
+- Output is a single-file HTML animation: press F for fullscreen, Enter to play, C to export two cover PNGs; BGM is added separately in your video editor
+- Ships with hard readability rules (Douyin safe area, minimum font size, pure-white text) distilled from real publishing experience
+- Uses progressive disclosure: SKILL.md holds the main workflow, while tech spec and publishing strategy live in references/ and load on demand